Wiseco 1200cc EVO Sportster 10.5:1 Compression Piston Kit - Harley Sportster
About Wiseco
Wiseco has forged pistons in Mentor, Ohio since 1941, supplying everything from factory race teams to big-bore street builds. Forged construction is what lets a V-twin survive higher compression and more cylinder pressure than the stock cast piston was designed for.
Maximize the power and reliability of your 1200cc Evolution Sportster with this Wiseco forged piston kit. Engineered for a 10.5:1 compression ratio, these pistons are built from high-silicon, low-expansion aluminum for superior strength and heat transfer. Experience a noticeable improvement in your Sportster's performance and durability.
Why riders pick this
- Forged high-silicon, low-expansion aluminum
- Diamond-turned finish for precise fitment
- 10.5:1 compression ratio for enhanced power
- Compatible with all common cylinder bore types
- Superior strength and heat transfer
This Wiseco forged piston kit is specifically designed for 1200cc EVO Sportster engines, featuring a robust 10.5:1 compression ratio that's perfect for riders seeking enhanced performance. Constructed from high-silicon, low-expansion aluminum, these pistons offer significantly greater strength and improved heat transfer compared to traditional cast pistons. The diamond-turned finish ensures precise tolerances and zero size variation, which is crucial for consistent engine operation and longevity. Furthermore, these pistons are compatible with various cylinder bore types, including cast iron, chrome, nikasil, and boron composite, making them a versatile upgrade for your Sportster.
Engineered for Sportster Power and Durability
- High-silicon, low-expansion aluminum forging for superior strength
- Diamond-turned finish with no size variation for precise fitment
- Compatible with cast iron, chrome, nikasil, and boron composite bores
- CNC-machined for exact tolerances and consistent quality
- Oversized options available for cylinder resleeving or boring
Unlock Your Sportster's True Potential
Whether you're rebuilding your 1200cc Sportster engine or looking for a significant performance boost, these Wiseco pistons provide a solid foundation. Their high compression ratio and durable construction are ideal for riders who push their bikes hard. For the best results, consider combining this piston kit with a performance cam and a professional dyno tune to fully optimize your Sportster's power delivery and ensure peak performance.
Specifications
- Brand: Wiseco
- Manufacturer Part #: K1685
- Compression Ratio: 10.5:1
- Engine Size: 1200cc EVO Sportster
- Length: 9.7 in
- Width: 5 in
- Height: 4.1 in
- Weight: 2.4 lbs
Common questions
Will this piston kit work with my chrome-lined cylinders?
Yes, Wiseco pistons are fully compatible with cast iron, chrome, nikasil, and boron composite cylinder bores, ensuring broad application.
Do I need to get my cylinders bored for these pistons?
This kit provides standard 1200cc pistons for unmodified cylinders. Wiseco also offers oversized options if you are resleeving cast iron cylinders or require a bore increase.
Will these pistons improve my Sportster's performance?
Yes, with a 10.5:1 compression ratio and forged construction, these pistons are designed to enhance engine power and durability, especially when paired with a proper tune.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Wiseco |
| TYPE | Piston kits & Components |
| SKU | K1685 |
| WEIGHT | 2.4 lb |
| 10.5 | 1 Compression |
